I have been using DXM since 2003. I stopped in 2012, but I can assure you, I know a lot about it. Maybe not the chemical compound and all that fancy stuff that some of these people on here know, but I know what it's like and a lot about it. I don't take it now because I'm on an anti-depressant, and it interacts with my anti-depressant, as well as any SSRI/SNRI/MAOI (it says so on the bottle). Be careful when you mess with the stuff. Check the active ingredients on the bottle. Definitely do not buy anything that has more than DXM in it. Guaifenesin and DXM (Robitussin DM) I have taken in the past and I threw up a lot, and I hear that that expectorant (Guaifenesin) was used to kids who used to ingest the stuff to trip. There are a lot more harmful chemicals listed in some other Robitussin bottles that are not mainly for Cough, NEVER DO CORICIDIN, it's a cough AND cold medication. Any Robitussin that are only for coughs, you should still check the Active Ingredients section on the back and make sure there is only Dextromethorphan to make sure you do not harm yourself. I suggest you do not chug a bottle either, that's unsafe for your first time using it, I've done it, but I myself only take 2 full dosage cups at a time, and even that gets intense for me, even when I was experienced with the stuff. What did you want to know about DXM though? I can describe a lot about it.